Understanding JWT Authorization

Author: Muhammad AbdulMoiz

JSON Web Tokens

Who am I?

Author: Muhammad AbdulMoiz

Muhammad AbdulMoiz
Software Engineer @
LinkedIn profile
Github profile

Technologies i have worked on

Author: Muhammad AbdulMoiz
Javascript
Angular
Ionic
RxJs
ngRx
KoaJs

Topics

  • Introduction and JWT Authorization
  • Stateless protocol
  • Authorization Strategies
 

JWT

Web Crawling and Scraping

 

A web crawler is an internet bot that systematically browses world wide web for the purpose of extracting useful information.

 

Extracting useful information from a webpage is termed as web scraping.

Web Crawling and Scraping

 

Web crawling just indexes the information using bots, where as web scraping aka web data extraction is an automated software technique of extracting information from web.

Web Crawling and Scraping

Tools we need

 

  • Bots to crawl and index information page
  • Scraping tools to extract out useful information

Strategy to Crawl and scrap

Tools we will be using for basic demo

 

  • Python request module use to make a crawler bot
  • Parsel library use as a scraping tool

Demo code!

import requests
from parsel import Selector

### Crawling to the website

# GET request to recurship site
response = requests.get('http://recurship.com/')

## Setup for scrapping tool

# "response.txt" contain all web page content
selector = Selector(response.text)  

# Extracting href attribute from anchor tag <a href="*"> 
href_links = selector.xpath('//a/@href').getall()


#Extracting src attribute from img tag <img src="*">
images_link = selector.xpath('//img/@src').getall()

Github Link : https://github.com/abdulmoizeng/crawlers-demo/blob/master/crawler-demo/spider.py

Bot and Scraping tool demo

*****************************href_links************************************
[u'#primary', u'http://recurship.com/', u'http://recurship.com/', u'http://recurship.com/', u'http://recurship.com/about/', u'http://recurship.com/playthinks/', u'http://recurship.com/build-a-mvp/', u'http://recurship.com/careers/', u'http://recurship.com/contact/', u'http://recurship.com/blog/category/uncategorized/', u'http://recurship.com/blog/2018/07/08/2018-7-8-sastaticket-acquires-recurship/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/2018/07/08/2018-7-8-sastaticket-acquires-recurship/', u'http://recurship.com/blog/2018/07/08/2018-7-8-sastaticket-acquires-recurship/', u'http://recurship.com/blog/category/uncategorized/', u'http://recurship.com/blog/2018/06/03/2018-6-4-ngrx-selectors-how-to-stop-worrying-about-your-store-structure/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/2018/06/03/2018-6-4-ngrx-selectors-how-to-stop-worrying-about-your-store-structure/', u'http://recurship.com/blog/2018/06/03/2018-6-4-ngrx-selectors-how-to-stop-worrying-about-your-store-structure/', u'http://recurship.com/blog/category/uncategorized/', u'http://recurship.com/blog/2018/06/03/2018-6-1-jjknwadn9ivw1gba3wxsspjlpe9grk/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/2018/06/03/2018-6-1-jjknwadn9ivw1gba3wxsspjlpe9grk/', u'http://recurship.com/blog/2018/06/03/2018-6-1-jjknwadn9ivw1gba3wxsspjlpe9grk/', u'http://recurship.com/blog/category/uncategorized/', u'http://recurship.com/blog/2018/06/03/2018-5-31-angulars-user-authentication-tool-belt/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/2018/06/03/2018-5-31-angulars-user-authentication-tool-belt/', u'http://recurship.com/blog/2018/06/03/2018-5-31-angulars-user-authentication-tool-belt/', u'http://recurship.com/blog/category/uncategorized/', u'http://recurship.com/blog/2018/06/03/2018-5-31-xfvrq9aauqkayhkd4kzp7gsbfg2bfl/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/2018/06/03/2018-5-31-xfvrq9aauqkayhkd4kzp7gsbfg2bfl/', u'http://recurship.com/blog/2018/06/03/2018-5-31-xfvrq9aauqkayhkd4kzp7gsbfg2bfl/', u'http://recurship.com/blog/category/uncategorized/', u'http://recurship.com/blog/2018/06/03/2018-5-31-real-time-stream-processing-with-reactive-extensions-rx/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/2018/06/03/2018-5-31-real-time-stream-processing-with-reactive-extensions-rx/', u'http://recurship.com/blog/2018/06/03/2018-5-31-real-time-stream-processing-with-reactive-extensions-rx/', u'http://recurship.com/blog/category/uncategorized/', u'http://recurship.com/blog/2018/05/31/2018-5-31-supercharging-the-angular-cli-with-nx/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/2018/05/31/2018-5-31-supercharging-the-angular-cli-with-nx/', u'http://recurship.com/blog/2018/05/31/2018-5-31-supercharging-the-angular-cli-with-nx/', u'http://recurship.com/blog/category/uncategorized/', u'http://recurship.com/blog/2018/05/31/2018-5-31-angular-as-a-strategy-for-collaboration-and-scale/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/2018/05/31/2018-5-31-angular-as-a-strategy-for-collaboration-and-scale/', u'http://recurship.com/blog/2018/05/31/2018-5-31-angular-as-a-strategy-for-collaboration-and-scale/', u'http://recurship.com/blog/category/uncategorized/', u'http://recurship.com/blog/2018/05/12/keynote-five-years-of-angular/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/2018/05/12/keynote-five-years-of-angular/', u'http://recurship.com/blog/2018/05/12/keynote-five-years-of-angular/', u'http://recurship.com/blog/category/uncategorized/', u'http://recurship.com/blog/2018/04/29/2018-4-29-understanding-advanced-dependancy-injection-in-angular/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/author/mashhoodr/', u'http://recurship.com/blog/2018/04/29/2018-4-29-understanding-advanced-dependancy-injection-in-angular/', u'http://recurship.com/blog/2018/04/29/2018-4-29-understanding-advanced-dependancy-injection-in-angular/', u'http://recurship.com/page/2/']
*****************************/href_links************************************


*****************************image_links************************************
[u'http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg', u'http://recurship.com/wp-content/themes/stag-blocks/images/menu.svg', u'http://recurship.com/wp-content/themes/stag-blocks/images/close-button.svg', u'http://recurship.com/wp-content/themes/stag-blocks/images/search.svg', u'http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg', u'http://2.gravatar.com/avatar/8a081ac7e6aadaabfdc51ec038867890?s=80&d=mm&r=g', u'http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg', u'http://2.gravatar.com/avatar/8a081ac7e6aadaabfdc51ec038867890?s=80&d=mm&r=g', u'http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg', u'http://2.gravatar.com/avatar/8a081ac7e6aadaabfdc51ec038867890?s=80&d=mm&r=g', u'http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg', u'http://2.gravatar.com/avatar/8a081ac7e6aadaabfdc51ec038867890?s=80&d=mm&r=g', u'http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg', u'http://2.gravatar.com/avatar/8a081ac7e6aadaabfdc51ec038867890?s=80&d=mm&r=g', u'http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg', u'http://2.gravatar.com/avatar/8a081ac7e6aadaabfdc51ec038867890?s=80&d=mm&r=g', u'http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg', u'http://2.gravatar.com/avatar/8a081ac7e6aadaabfdc51ec038867890?s=80&d=mm&r=g', u'http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg', u'http://2.gravatar.com/avatar/8a081ac7e6aadaabfdc51ec038867890?s=80&d=mm&r=g', u'http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg', u'http://2.gravatar.com/avatar/8a081ac7e6aadaabfdc51ec038867890?s=80&d=mm&r=g', u'http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg', u'http://2.gravatar.com/avatar/8a081ac7e6aadaabfdc51ec038867890?s=80&d=mm&r=g', u'http://recurship.com/wp-content/themes/stag-blocks/images/back.svg']
*****************************/image_links************************************


'Time taken in seconds : ', 0.28676700592041016

Make it crawl more!

### Crawling to the website -> fetch links and images -> store images -> 
### crawl more on fetched links and scrap more images

import requests
from parsel import Selector

import time
start = time.time()


all_images  = {} # website links as "keys" and images link as "values"
# GET request to recurship site
response = requests.get('http://recurship.com/')
selector = Selector(response.text)
href_links = selector.xpath('//a/@href').getall()
image_links = selector.xpath('//img/@src').getall()

for link in href_links:
    try:
        response = requests.get(link)
        if response.status_code == 200:
            image_links = selector.xpath('//img/@src').getall()
            all_images[link] = image_links
    except Exception as exp:
        print('Error navigating to link : ', link)

print(all_images)
end = time.time()
print("Time taken in seconds : ", (end-start))

Github link: https://github.com/abdulmoizeng/crawlers-demo/blob/master/crawler-demo/spider2.py

Make it crawl more!

('Time taken in seconds : ', 21.02056312561035)

Two main tools used!

  1. Python request package

  2. Python parsel package

What request module offers

  • HTTP method calls
  • Working with response codes and headers
  • Maintains redirection and history for requests
  • Maintain sessions
  • Work with cookies
  • Errors and exceptions

What parsel module offers

  • Extract text using CSS or XPath selectors
  • Regular expression helper methods

Why would we need other "request" package features?

Consider a library website which offers you to borrow a book for particular time but it only offers to authorized users and it have a huge collection of books in different categories

 

  1. Start a session
  2. Perform authorization request (using credentials)
  3. Set authorized cookies for future requests
  4. Hit fetch book request with categories
  5. Get the response and scrap the required data

Steps

Creating a Helper class to serve


LOG_PREFIX = 'RequestManager:'


class RequestManager:
    def __init__(self):
        self.set_user_agents();  # This is to keep user-agent same throught out one request

    crawler_name = None
    session = requests.session()
    # This is for agent spoofing...
    user_agents = [
        'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.246',
        'Mozilla/4.0 (X11; Linux x86_64) AppleWebKit/567.36 (KHTML, like Gecko) Chrome/62.0.3239.108 Safari/537.36'
    ]

    headers = {}

    cookie = None
    debug = True

    def file_name(self, context: RequestContext, response, request_type: str = 'GET'):
        url = urlparse(response.url).path.replace("/", "|")
        return f'{time.time()}_{context.get("key")}_{context.get("category")}_{request_type}_{response.status_code}_{url}'

    # write a file, safely
    def write(self, name, text):
        if self.debug:
            file = open(f'logs/{name}.html', 'w')
            file.write(text)
            file.close()
    
    def set_user_agents(self):
        self.headers.update({
            'user-agent': random.choice(self.user_agents)
        })

    def set_headers(self, headers):
        logger.info(f'{LOG_PREFIX}:SETHEADER set headers {self.headers}')
        self.session.headers.update(headers)

    def get(self, url: str, withCookie: bool = False, context):
        logger.info(f'{LOG_PREFIX}-{self.crawler_name}:GET making get request {url} {context} {withCookie}')
        cookies = self.cookie if withCookie else None
        response = self.session.get(url=url, cookies=cookies, headers=self.headers)
        self.write(self.file_name(context, response), response.text)
        return response

    def post(self, url: str, data, withCookie: bool = False, allow_redirects=True, context: RequestContext = {}):
        logger.info(f'{LOG_PREFIX}:POST making post request {url} {data} {context} {withCookie}')
        cookies = self.cookie if withCookie else None
        response = self.session.post(url=url, data=data, cookies=cookies, allow_redirects=allow_redirects)
        self.write(self.file_name(context, response, request_type='POST'), response.text)
        return response

    def set_cookie(self, cookie):
        self.cookie = cookie
        logger.info(f'{LOG_PREFIX}-{self.crawler_name}:SET_COOKIE set cookie {self.cookie}')

Github code link: https://github.com/abdulmoizeng/crawlers-demo/blob/master/library-example/spider.py

Using Helper class


Request = RequestManager()

context = {
    "key": "demo",
    "category": "history"
}
START_URI = "DUMMY_URL" # URL OF SIGNUP PORTAL
LOGIN_API = "DUMMY_LOGIN_API"
response = Request.get(url=START_URI, context=context)

Request.set_cookie('SOME_DUMMY_COOKIE')
Request.set_headers('DUMMY_HEADERS')

response = Request.post(url=LOGIN_API, data = {'username': '', 'passphrase': ''}, context=context)

# HERE YOU CAN DO BOOK FETCH API CALL AS PER DESCRIBED SCENARIO

Github code link: https://github.com/abdulmoizeng/crawlers-demo/blob/master/library-example/spider.py

Notice the extra work we have done!

  • Updating headers
  • Saving cookies
  • Saving response log files

Improvements in our image scraper, Using AsyncIO

import requests
import aiohttp
import asyncio
from parsel import Selector
import time

start = time.time()
all_images  = {} # website links as "keys" and images link as "values"

async def fetch(session, url):
    try:
        async with session.get(url) as response:
            return await response.text()
    except Exception as exp:
        return '<html> <html>' #empty html for invalid uri case

async def main(urls):
    tasks = []
    async with aiohttp.ClientSession() as session:
        for url in urls:
            tasks.append(fetch(session, url))
        htmls = await asyncio.gather(*tasks)
        for index, html in enumerate(htmls):
            selector = Selector(html)
            image_links = selector.xpath('//img/@src').getall()
            all_images[urls[index]] = image_links
        print('*** all images : ', all_images)


response = requests.get('http://recurship.com/')
selector = Selector(response.text)
href_links = selector.xpath('//a/@href').getall()
loop = asyncio.get_event_loop()
loop.run_until_complete(main(href_links))


print ("All done !")
end = time.time()
print("Time taken in seconds : ", (end-start))

Github code link: https://github.com/abdulmoizeng/crawlers-demo/blob/master/async-crawler-demo/spider.py

Improvements in our image scrapper, Using AsyncIO

Time taken in seconds :  6.124678134918213
('Time taken in seconds : ', 21.02056312561035)

Previous result below

Open Source Python Frameworks for spiders

  • Scrapy 
  • Pyspider
  • Mechanical soup

Open Source Python Frameworks Scrapy

Scrapy is a scraping framework supported by an active community with which you can build your own scraping tool. In addition to scraping and parsing tools, it can easily export the data it collects in a number of formats like JSON or CSV and store the data on a backend of your choosing. It also has a number of built-in extensions for tasks like cookie handling, user-agent spoofing, restricting crawl depth, and others, as well as an API for easily building your own additions.

Open Source Python Frameworks Scrapy

Scrapy also offers a cloud to host spiders where spiders scale on demand and run from thousand to billions. Its like heroku of spiders.

Image crawler using Scrapy

import scrapy


class AuthorSpider(scrapy.Spider):
    name = 'Links'

    start_urls = ['http://recurship.com/']
    images_data = {}
    def parse(self, response):
        # follow links to author pages
        for img in response.css('a::attr(href)'):
            yield response.follow(img, self.parse_images)

    def parse_images(self, response):
        def extract_with_css(query):
            return response.css(query).extract()
        yield {
            'URL': response.request.url,
            'image_link': extract_with_css('img::attr(src)')
        }

Github code link: https://github.com/abdulmoizeng/crawlers-demo/blob/master/scrappy-demo/spider.py

Image crawler using Scrapy

pip install scrapy
scrapy run spider -o output.json spider.py

Output file

[
{"URL": "http://recurship.com/blog/2018/06/03/2018-6-4-ngrx-selectors-how-to-stop-worrying-about-your-store-structure/", "image_link": ["http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg", "http://recurship.com/wp-content/themes/stag-blocks/images/menu.svg", "http://recurship.com/wp-content/themes/stag-blocks/images/close-button.svg", "http://recurship.com/wp-content/themes/stag-blocks/images/search.svg", "http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg", "http://2.gravatar.com/avatar/8a081ac7e6aadaabfdc51ec038867890?s=80&d=mm&r=g", "http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg", "http://static1.squarespace.com/static/5618e3e3e4b0b6c3336cd921/561f6ac9e4b039aec9b09e7d/5b8cd34a40ec9a2651e74a36/1535955794061/black-frost-ripples-1280.jpg", "http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg", "http://static1.squarespace.com/static/5618e3e3e4b0b6c3336cd921/561f6ac9e4b039aec9b09e7d/5b1468ac562fa731e988d9e9/1528064179895/0.png", "http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg", "http://static1.squarespace.com/static/5618e3e3e4b0b6c3336cd921/561f6ac9e4b039aec9b09e7d/5b1468ba88251b5f16507385/1528064193239/1.png", "http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg", "http://static1.squarespace.com/static/5618e3e3e4b0b6c3336cd921/561f6ac9e4b039aec9b09e7d/5b1468c8758d4674dd83cd64/1528064205553//img.png", "http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg", "http://static1.squarespace.com/static/5618e3e3e4b0b6c3336cd921/561f6ac9e4b039aec9b09e7d/5b1468dfaa4a99a4052fea7e/1528064229850/3.png", "http://recurship.com/wp-content/themes/stag-blocks/images/placeholder.svg", "http://static1.squarespace.com/static/5618e3e3e4b0b6c3336cd921/561f6ac9e4b039aec9b09e7d/5b1468f1562fa731e988e3a1/1528064250573/4.png", 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]

Time taken

'start_time': datetime.datetime(2019, 1, 10, 20, 59, 40, 954298)}
2019-01-11 01:59:47 [scrapy.core.engine] INFO: Spider closed (finished)

# i.e with in 1 sec

Search engine design and crawlers

How to crawl dynamic rich websites which needs Javascript to load?

  • It needs a browser to simulate dynamic behavior of page
  • Actions can generate extra data in any new event generation

How to crawl dynamic rich websites which needs Javascript to load?

Selenium headless comes to the rescue, It can be use with Chrome , FireFox or any other selenium supported browser

Headless chrome installation

We need to install two tools

  • Chrome binary
  • Chrome driver

 

Step by step guide: https://gist.github.com/abdulmoizeng/e1a61923a1928baeb54175f28e054adb

Chrome Headless Bot

Github code : https://github.com/abdulmoizeng/crawlers-demo/tree/master/headless_bot

Code samples!

https://github.com/abdulmoizeng/crawlers-demo

https://medium.com/@abdulmoizeng

Code will also be published as medium article

https://www.youtube.com/channel/UCUb-UFZAwJQtTFIYl_Ppi6A

Subscribe Recurship Youtube channel for talk and related videos

Questions!

JWT Authorization

By Muhammad AbdulMoiz

Made with Slides.com

JWT Authorization

Understanding JWT Authorization

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